Signal system



Oct. `1'1, 1927.

- 1,645,353 E. E. SALISBURY SIGNAL SYSTEM Filed Jan. 24, 1925 3Sheets-Sheet 1 Oct- 11 1927' E. E. SALISBURY SIGNAL SYSTEM 1925 3Sheets-Shaml 2 Filed J'an 24 SIGNAL SYSTEM Filed Jan. 24, 1925 5sheets-sheet 3 Patented Get. 11, 1927.

lillttll STATES PATENT Fllll.

EDGAR E. SALSBURY,

SIGNAL Application filed January rlhis invention relates to a signalsystem, and more particularly to a system of automatic control lorpatrolmens movements, in which system is provided means tor causing anautomatic alarm at some selected station, as a. police station, Withinaipredetermined time, and in a predetermined order, atler failure of thepatrolman or patrolmen to properly operate any station box on his beator route, and also upon any interruption to the circuit in which suchboxes areplaced.

To this end the principal object of my invention, broadly considered, isto provide a series oic patrolmens boites designed and electricallyconnected in such manner that when operated in accordance with aprearranged schedule no record is made ot the progress oi the patrolmanor patrolmen from station to station, or ot the time or times any one ormore patrolmen report at the several stations', but when not operated inaccordance with the schedule, will automatically give an alarm or causea signal to appear in a central station.

Another broad object ot my invention is to provide a means, in such asystem, to give an alarm or signal upon any interruption to or closingof the circuit in which such boxes are placed, depending upon Whether aclosed or open circuit is used.

ianother object of my invention is to provide a station box andautomatic supervisor tor a system of the kind rei'erred to, each ofWhich is a unitary mechanism and, consequently, which may be shippedready assembled Without chance of loss or displacement of the componentparts thereof.

A further object ot my invention is to provide a series ot' electricallyconnected station bones in Which only one or more selected boxes may beoperated attlie same time.

Still another object ot my invention is to pro vide an automaticsupervisor for such a system comprising an electro-mechanical attachmenttor an ordinary clock movement, and constructed in such manner that Willnot cause an alarm or give a signal when the system is functioningnormally and properly operated.

There are many other objects ot' the invention which Will appear fromthe following more detailed description thereof when considered inconnection With the accompanyingdrawings which have been chosen toillustrate the saine, and in Which:

OF CHICAGO, ILLINOIS.

SYSTEM.

24, 1925. Serial No. 4,547.

Fig. l is a schematic vievv of the system, showing diagrammatically thedetails ol structure ot' the automatic supervisor;

Fig. 2 is a front elevation of a station box designed *for use on aclosed circuit with the cover removed, shov-.ring a part ot' theinternal mechanism in elevation and set in oper ative` position for apatrolmans visit;

Fig. 3 is a section taken along the line 33 of Fig. 2;

Fig. e is an end elevation of the box illus trated in F ig. 2;

Fig. 5 is a View similar to Figp, but showing a station boi; desiO'nedfor use on an open circuit;

Fig. 6 is a side elevation of the trated in Fig. 5; Y

`Fig. 7 is an end elevation ot the box illustrated in Fig. 5;

Fig. 8 is a side elevation oi the pulley mechanism of the supervisor;and

Fig. 9 is a Wiring diagram illustrating the manner of connecting aseries ot" open circuit patrolmens boxes in an open circuit.

It. is desirable t'or public authorities, owners of factories and largeot'llce buildings, and other persons Who employ patrolmen or Watchmen,to determine Whether or not the latter are performing their duties, andmany mechanical and electrical systems have been devised With this endin View. In all oit them, however', in so tar as applicant is aware, itis necessary for the watchman to turn in an alarm at some centralstation from different points or stations on his route. `When such analarm is turned in, a record of that fact is made, together `With thetime it is received, and in this Way the progress of the Watchman orpatrolman from station to station is checked.

The present invention obviates the necessity o'f checking patrolmen at acentral station When they are functioning emciently and While the systemis in `good Working order. In a general Way this object is attained byproviding station route boxes ot a novel design at specified locationson the street or throughout a factory, tor example, and having thepatrolinan operate the same in a predetermined order in accordance Witha time schedule. It the boxes are operated in accordance With suchschedule no alarm or signal of any kind is made. On the other hand, ifthe patrolman neglects or fails to operate any box on time, or if forany reason izo the device getspoutiot order, as wheii a line Sbi'ekeniaelmm elisir-,nel iii-llaa ally be turned in at the central lstatrically connected in the system, whereupon an appropriate investigationmay inode.

lll/ith these purposes andnobjects in `iniiid I have conceived anddevised the structural idetails andarrangeinentojt 4parts illustrated bythe" acconipaiiyiiigi` drawings. Referring now to, such drawings,I andparticularly to the details of structure and. arrangement ot l partsthereof by. reference characters ,or numerals, in which like charactersoriiiiinerzils `desigiiate likeA parts, andinore especially to Fig'.tthereo't, theiteiierence, character A b wires throuoh asourceoitelectrical energy D, to an automatic. supervisor; E, .the Hsysteinbeinat ing devicesM, as elec-.trici ills, are connected grounded `at T.f. Twosignalto the supervisor through a source of electrical,energy,.asibywires a, andA such` bells are grounded at X. 1 v havelillustratedf-two ,types of station boxes A, one designed toi-.ilseonaii open `circuit ,and .the other on. a .closed circuit.

Either may `be used Vas desired yo iwheii. local conditions reduire.4

The closed Circuit boX ilhistrated'by.

2 and?) is these-nie iiiccons'ituctionlas .all ,boxes used ina closedcircuit system.. vThis V35, having` a cani surface which is adapted .toslide overthe said pins..

box consistent acase 1 in which is. mounted .an. electro-inagnetl 2.0i?-ordinary` construction-.. The, cores ot this magnet. attract. anarmature 3,..whichisinountedon a yflange ota slidinaplatetas.bylineaiisotscrews .6, althoughthe armature and plate inaybe made integralitydesired. The4 plate .tis

. mounted. .in grooves on A.the .outer eiidsfot guides Sand. 8@ whichguidesiextend through and are. iiiedin the h acklo'l" `the `case 21....For

. vthis purpose. the` plate. is provided .with slots f, engaging-.saidgrooves. A Astud k9 is iixed in the 4back ot: the case 1 `and extendsthroughand,beyondiafslot 9...inthe center of plate 4l, as .by meansotscrews 15, isan angle release `arm 16,. thegfree i end y .17 ,oitwhich .ex-

tends upwardly along and spaced,` from .the said plate,iaiid-sucli endis. providedwitlra forwardly extending; projection `1S.

instable setscrew 19 is passed through a stud M 21, fixediininediatelyunder the slidineplate An; ad-

4l' ,for limiting the. ,downward movement The control wheel 22above'inentioiied A.spacedpins 25.

. ciprocation ot the plate. This arrangement isknown iutheliorologicalart as a pinwheel escape inoveiiient, and inay be replaced designatespatrolinenis route station boxes (three being shown)electricallyconnected `is provided witha series,otcircuniterentially.arrangedf .fQr'inirdly.. .projecting i. equal 1y This wheel isrotatably and Xedly mounted on the stud 9, in the groove 10, by'anysuitable -iiieans, as by a sci-ew i1 and washer 12. ri"he pins 25 arefixed in the"p'e`.riphery ot the flange 26 of the contro'lwheelZ'Zlpwhicli wheel is provided with a hollow forwardly Vprojectingannular flange 27,. on which isiixedly mounted a disc QS; `awls 31, aremounted on, the front side taces ofthe platetto alternately engage invthe present invention by 4any otherinechanical ,nioif'einent y.wherebythe control wheel [22 iii-ay `be actuated ,by the `sliding` f".platel--` For exainple, a toothed wheel inay be substituted for the pinwheel @Zand eiigagged bythe pawls 31.

A series of aperturesBQ 'are drilled.

through and. around the periphery of ,the

(M5028, and vdetachable. lifting pins 38 are .inserted therein forapurpose to be pres .ently slated... These.aperturesinay or, may not. bevequally spaced, as desired.

. Ani angular. lock` lever 34 is, pivotally `mounted, as. by ,ineans ofpivot pin 38., in the case, in suchinannerthat the end ot .one armthereof inay engagethe pins For this purpose `.such end. is provided.with a 'linger 4and adaptedto engage aforwardly extend- 4ing.propection39 ony an angular control lever 41, .which vwill now be described.

The Vcontrol lever 41 is pivoted on thepivot pin. 12in such niannerthat. one ariii thereot will extend under the disc 28 andthrough an.opening inthe side of the Vcase 1(i.nthe con .struction shown .in Fig'.2) ,l and ,terininate .inside ofthe casein theeonstruction shown..

by Fig. 5..; The v.othere iid, 4e3 ot' this lever yis providedwith aspring; Contact arin fiel,

which isniounted on an insulation 4.5,.t`iiied onthe said.4 arin.Ordinarily. `the `control havingthe free end thereof. passed .underxalug 1.0011 .the said. lever.. i

A binding post 46 is positioned on the case l lever isheld in a raisedposition by ineans of. .a spring @f1-coiled.around thestud 42 and 1under. the contactarin and. electrically i.

connected. thereto by ineaiis of a. coiled wire if and .to theinaincircuit 4through the inediiiin of the insulated, wirel. Adjacentthesaid postwar-n adjustable screw 4 8, functioning as a. Contact post forthe arin 44, is provided. rthis screw is electrically connected, byineans tion a three-station route is disclosed.

mounted on a sha'lt 57. A slip collar 58, provided ith contact frictionsprings 53),

59', on the ends thereof, is splined on the shaift 57. This collar isprovided at a point intermediate its ends with a groove in which aslidable yoke 6l is mounted.

There is also loosely mounted on the :hatt 5T, at the ends ot the collar58, two grooved pulleys 62, 62. rlhese pulleys are positioned by collars63 fixed on the shaft. Each pulley is provided with a weight 66, whichis connected thereto by means ot a cord,-

tieible wire, chain, or other securing device 6T, one end of the samebeing secured to the pulley. i tell-tale Contact arm 68 is secured toeach pulley in such position that a sutilcient rotation of the same willbring` the. said arm into contact with a lug 69 on the end ot andinsulated trom an arm 70, which arm is adjustably mounted on the shaftbearing. rlhe lug 69 is electrically connected, through a source otelectric energy l), by means ot the wires a, to an ordinary electricbell or buzzer M, which is grounded at X, in the circuit Selected toillustrate my invention.

The yoke 6l, above mentioned, constitutes one end of a lever 7l, whichis pivoted, by means ot a pin 72, intermediate its ends. One end ot alink T3 is plvoted, by a pin 74, to the tree end ot the lever 71, theopposite end ot said link being pivoted at to the end ot au armature 7eot' an electro-magnet 'T6 in the main circuit ot the system. Theopposite end of the armature Til is piyoted by means orn a pin TT.Adjustable screws 750 are provided tor holding the armature Til inhalt-way or neutral position.

lt will be understood that the parts or' the devices herein disclosedare properly insulated wherever necessary, and'that a suitable bonv orframework is provided tor my supervisor, a speciiic description ot thedetails ot structure of the saine being` considered unnecessary tor thepurposes of this speciiication.

For the purpose ot illustrating my invenln operation ot such a route theflexible cords 67 (Fig. l) are unwound and the tell-tale contact arms 68adjusted with respect to the arms 69. The pulley 62 is rotated to aposition such that the said arm 68 will rotate to a point adjacent butnot touching the contact lug 69, and then return to normal positionthrough the automatic reversal of the pulley when the station boxes areoperated at the proper time. y

To effect this result we may suppose that the boxes are set toroperation at one hour intervals in the order they appear in the circuit,although they may be set tor operation at any interval ot time and neednot be operated in the order above stated, and that the iirst bor; is tobe operated at two oclock. :it one oclock, ior example, which will be`indicated by the clock mechanism (not shown) connected to the sha'jt 54,the cord 6T (letthand side ot Fig. l) is unwound, as illustrated, andthe movable contact lug 69 and pulley 62 are set as shown by Fig. l, andthe contact vitriction spring 59 on the splined collar 58 is caused toengage the said pulley, the friction spring 59 on theoppositev end otsaid collar being out orn contact with its corresponding` pulley.

rlliereupon movement of the clock mechanism begins, which causes theshaft 5ft tcrotate. The rotation of this shaft in turn rotates the gears55, 56, shaft 5T, collar 58, and pulley 62. As this pulley revolves itslowly winds up the cord 67, and raises the weight 66 and, at the sametime, brings the contact arm 68 thereon in increasingly closer relationwith the lug 69. y

fitter an hour has passed, viZ:-at two oclock, tor example, the tirstroute. bor; is operated; that is to say, the main line circuit .ismomentarily interrupted, as will later appear. Immediately upon theopening ot the circuit the electro-magnet 76 is demagnetized, whereuponthe spring Tel raises the armature 74e and shitts the collar 58 throughmeans orn the link 73 and lever 7l. rlhereupon the weight 66 will dropby gravity, causing the cord 67 to be unwound and the Contact arm 68returned to normal or rero position.

In the event, however, that the first, or any other box in the system,is not operated on time, the armature 7st will be held in the positionillustrated by Fig. l, and the clock mechanism will bring the arm 68into contact withl the insulated lug 69 after a predetermined intervalot' time, say tive minutes. lnasmuch as this lug is electricallyconnected to an electrical bell M, or other signaling device, located ina central station, it will be seen that an alarm or signal will then begiven.

The pulley 62 is'constructed and connected to a signaling device, as theone previously described. This pulley, however, is always out Ot contactwith the spring 59 so long as the main circuit is unbroken. But shouldsuch circuit become'interrupted for any reason, the armature Tl would bereleased through the demagnetization ot the electro-magnet 76, whereuponthe collar 58 would shift the said spring 59 into trictional engagementwith the said pulley, and

"towel" Syetenrand when eef deed; l

deemed Unnecessary present p lte'te'riing'now totheopeiicirci tbe 'andthe [proj ec 'circuit'eyetein` 'Normally `the artnetiii-'e entlydescribed.`

Lthe clockl lne'ehanisn'iL we ii'ldceuee' the afin 68 thereon to ContactWith its Corresponding" lng after a predetermined time and' thereby givean alarm, ae previously described. Wifhen 'so Shil'ted Vthe Contactspring 59 would be "dieengaged from' the corresponding pulley. l'

lt 'qbe desiredlto hold the cen'taet springs 59, 59', ont et' 'contaktitliboth' pulleys in "order tgperinit `he cloel-nieclianein to operatewithout eaiieingthe enpervie to' tunetion, the" screifzs 75O`1na`y be'adjueted toho'ld the arin'atiire Til inniidwayposition, which in turnwlll'shit the splinedcol'lai '58in neutral poeition;`

"Further, I desiieit to" be understood that although "Thavedescribed 'myanton ie siiperyieor connected witlifan' electricbell,

the latter ie connected inem-neotheieignaling Syetein;foi'eiainple,"it"niay` `be 'einployedin connection' witlia railiiaywatch els'iipf viso1``woulcl be connected to' the L 'ein hereinbe'ore`described and setv oil' an" alarin when the Lttnyernian`didnot operateanapcircuitat "predetermined" time`VA1` Bilbo, if desired, only one'det'ice'fin'ajyfbe connected to the supervisor to indicati-i'4 e1 beran' interruption" to "the c'irciiit or 'iipon `til-'1`i`i'e""of"anyonefto operate a"` rlh i cha'nfave` 'lie fwithin "theSkill 'of'a nieclianic, aiiddeci'ipt "1 etliictute on ne e" neceeeary toornpheli the!" agee are gpoees.

system, it will be noted frein inspection oit" Fig'. lhat niyhopen'circuit Station 'route box is'the Ine" 1n conetri'ictiona'e tlie'one"ptevoiielyl'deecribethexcept that the Contact poet 48 electricallyconnectedtoftlie inain circiit, byineane ofa wire' g, andlhat yio1r39"`on the"` kcontrol' leiter 'extende throiigl'i'aii openingl in'the ifi'font of the trae-ey lfto Serveasfan' operating"'liandle, the`lende" et" the leve ll being` 'on "the" inside of the bebe ln' Fi `9 'lliay "the manner olf sonnet ing; these boee in an open 7G', l andV wiresZ Vand A 7i 'back "to the said" elec- `troeine.,fgnetz Then'iagnetization of the elect'rofniagnet TG attracts 'the armature "Telfand efnzil to'be ,is yen, as will be pres4 `j Referring" to thetliee-tation"route 'eloeed oii'euitmbox Shown in'yFigjS. 23, the firstbox setas `illustrated."Tl1at 1S to say,

the armature 3 and Sliding,` 'plate 4 being iraisedmiid" the cainfaceonon`"ei1d of the 35 linger' "being` in engagement with one ot Vthelifting pineI *These pinsare inserted engagement witlith'e projection18cm' the release arm 16.

L pa'trolman 1nay\ 1iow depress the projeetingpendot theoperating'lever," which 75 demaguetizee the electro-magnet 2' by break-1 the inain 'circuit'thronghtle separation jo'l'tlieepring contactarniiMaand Contact screw 18. Thereup'onwtlre slidingplate 4drops"tl1rough"the `torce of `gravity, which 80 a pin onthecontrol"wheel 22 and partially rotates the sa'inefThe rotation 'ofthis wheel Causes the disc "23,S mounted thereon, toY also revolve andthe 'cani' Jaceo'n'the linger 35 to 55 contiene to ride onthe prn 33oneaid. dise.

'Simultaneously' :'tlieiewirtli, 'the circuit 'bei-ng broken, then1agnetY6"('Fig; l) is demagnet ized and" the weight 66 (left-hand eideof the hilaire) drops, as "previously" described. 90 Upon releasing thecontrol' leverY all the 'Spring flwreturns the saine to normal po-'Siti'oin closes tl'1eco1'1tarct `between thespring arin letand'screwcontz'ict post 48," where" upon'tlieV electro-magnet '2 reinagnetiZe-d95 and attracteiie 'armature and :thus causes Inblfeinent ofthis' plate'ceases the lowerinoet pawl 3l toengage another pin on the 'conf' 'trolwliee'l 22 anc'ipartially rotat'etlieeanie. 100A the disc to,revolv'eand t-hecaml face on the finger of 'lock "lever toridecompletely overfthe pin y331,"whereby*the said linger drops."behji'nd vthe 'eaidipin' andin' 'front of 105 Athenext faydJaeentholeand"'permitsA the projection on'the endo'f eaiddeye'r to lock under theprojection 39 onthe Control leiter.

Frein what has 'been saidit will Abe noted that a completereciproeati'onoffthe plate 110 #lf causee the' Cain 'face on ithlelinger '35 yto ride over andi p ast a pinv 33 'when the `mechanism-iseeta's"illi1strated l'by' Fig'. 2 *of the clrawi11gs."Two ineiie completerecip- 'rocatione ofthe plate' will'bringthe Said 115 cani surface 'intoContact iiith Athe nextv vadjacentpin when two holes' arel left betweenadjacent" pairspt' pins, as previously 1nen. tioned. y

"lli the three-Station"route 'boxes are' to 120 be operated'one aftertheothei "as 'they are p'laced'fin vtheline or circitftlie"disc :in

`the third`stat`ion boxwill'be set-,'juet before the lii"st"box ieoperated, so that the' finger n 35 willlbe in' frontot' a"pin,'a`nd thelinger 125 in the" 'second let-ation' boxz `will Abe between"twoh'ole'sl 'lnasinuch as" thel depression of any oneoperatng'leyeropens` the circuit,y

all of the magnets in all of the boxes will be simultaneouslydemagnetized. Consequently a depression and release of any operatinglever will cause the simultaneous operation of the mechanism in allboxes, which includes, of course, the simultaneous rotation of alldiscs.

The lifting pins in the discs being arranged and the mechanism in theboxes set` as specified, it will be seen that at the time the first boxis to be operated the other two are loclred by the interlocking oftheiprojections 37 and 39. The complete operation of the first box locksitself, unlocks the second, and leaves the third locled; andtheoperation of the second box loclrs itself, leaves the first locked, andunlocks the third,

Vand so on for the number of boxes used in the system. rllherefore, inany event the said boxes must be operated in a predetermined order.

Although the foregoing description relates particularly to a closedcircuit system, my invention may also be used in connection ith anopencircuit by initially raising the armature '74 (Fig. 9) and setting themechanism in all patrol boxes as illustrated by Fig. 5, and the discs aspreviously described, that is yto say, with the spring contact arm laout of contact with the adjustable contact post 118, whereupon themagnets 2 will be demagnetiaed and the sliding` plate 4l- 1n loweredposition.

ln a system of this kind, viz: an open circuit system, the Contactfriction spring 59 l) will ordinarily be in engagement with the pulley62', and the signaling device associated therewith used to indicate thefailure of a watchman to report at and operate any box within aspecified time after the time schedule, or upon failure of the boxsystem for any reason. The other signaling device will be used toindicate a closing of the circuit by accidental or other means.Otherwise the devicesfunction and operate as the closed circuitmechanism described.

Vi'hile I hare shown my invention as used in connection withthree-station route boxes, and described the same as adapted to beoperated in the order in which they .are placed in the circuit, I desireit to be distinctly understood that this arrangement and use of theinvention includes the use of any number of such boxes and is notlimited to the operation of the boxes in the order stated, since allboxes, and each of. them, regardless of number, may be set for operationat any predetermined time or times. It will further be understood thatmy automatic supervisor is adapted to set in operation any signalingmechanism, regardless of whether the latter is used in some othersignaling system. For example, it may be used to set 1n operation adevice in an ordinary police signal system to give an alarm or signal.

2.111 a signaling system, a central station, signal means within saidstation, a plurality'of patrol boxes, means for electrically connectingsaid boxes whereby they can be operated only in a predetermined order,and means for operating said signal at a Apredetermined time after saidVconnection becomes inoperative.

8. In an electrical circuit, the combination of ay plurality of patrol,boxes and a signal mechanism, said boxes comprising means for settingeach box for operation within a predetermined time after the operationof the preceding box, means comprising a winding mechanism and anelectro-magnet encrgized by the operation of said boxes for renderingthe same inoperative to produce a signal. when the said box is operatedon time.

Ll. In an electrical circuit, the combination of a plurality of patrolboxes and a signal mechanism, said boxes comprising means includingdiscs having Ipins therein for setting the same for operation withindifferent predetermined times and lthe said mechanism comprising meansfor rendering the same inoperative when the said boxes are operated ontime.

5. In an. electrical cir-cuit, `the combina.- tion of a plurality ofpatrol boxes and a signal mechanism, the said boxes comprising means forsetting the same for operation within different predetermined times andthe said mechanism comprising means including weights and pulleys forrendering the same inoperative when the said boxes are operated on time.

6. In station patrol mechanism, the combination with an yelectro-magnet,of an armature, and means including winding mechanism, associated withsaid armature for automatically setting the said mechanism for operationwithin a predetermined time.

7. In a station patrol mechanism, the combination with anelectro-magnet, of an armature, and means associated therewith forautomatically setting' said mechanism for operationwithin apredetermined time,

.ia I

the said means including a disc having pins projecting laterallytherefrom. x

8. In a station patrol mechanism, the combination VWith an`electroj-niagnet, of an armature on a sliding plate, andlmeans as"sociated wit-lisaid armature `for settingthe same for operation Withina predetermined time, `the said means including a disc having pinsprojectingtheiefroin, and means ,for locking the said mechanism ininoperative position.

9. The combination in ay station'patrol mechanism, of `anelectro-magnet, an arma- Yture toi said' magnet, the said armature beingon a sliding plate, a disc having pins projecting therefrom, vmeans for'operatively connecting the saidplate andthe said disc,

a'levei having a; cam surface on one en'd thereof for riding over the`said pins,` and f p means for locking the said' mechanism.

10In a supervisor for a system of the kind herein disclosed, thecombinationwith an electro-magnet, ci a signaling device,

`and means including Winding mechanism,

associated ivitli said device for normally rendering the sameinoperativeivhen said electro-magnet is energized.

Il'. Iii a signaling mechanism, the coinbination ot a pulley having a.flexible cord and Contact arm thereon, a WeightV on said` cord, a shaftfor said'pulley, a splined colL lar on said" shaft for engaging saidpulley,

means including an electro-magnet asso-V ciated with; said' collar forthrowing the same into and out of engagement with said pulley, asigna-ling device, and electricalV connections between' said arm anddevice and for saidineans whereby Ythe saidfmechanisin is renderedoperable. n

12. A signal system comprising a plurality. of' patrol boxes and anautomatic signaling device,`electrical means connecting said boxes; anddevice, and means" whereby said boxes when operatedmustbe operated in apredetermined order, but may be operated at any time Within apredetermined ingenteY period after the operation of the Ypreceding nbox:

13. In a'signal system, an automatic signal device, supervisor mechanismfor controlling the operation ot saiddevice, means for operatingsaiddevice when said mechanism is notl operated'within a predeterininediltime after its preceding operation, a plu-4 rality of patrol boxes,means tor operating said mechanism when any one of said boxes `isoperated, and means tor preventing the operation of said boxesexcept ina predetermined order, butpermittingany box.

to be'opeiatedy at any tiineivithin aV predetermined period atter theoperation'otthe preceding boxr for preventing the operation oi' saidsignal device. f

141 In a signal system, a signal device, a

plurality otpatrol" boxes, means for automaticallt7 operating saiddevice When any one'ot saidboxes is not operatedWit-hin a vpredeterminedtime after the opera-tion otv the preceding box, and means'vforprevent-l ing the opera-tion ot said boxes except in a predeterininedv`order, but permitting any box to be operatedrat any time Within apredetermined period a't'ter the operation of the preceding box` forpreventing the operation otsaid signal device. I

l5. In asignal system, a signal deviceT supervisorfmechanism adapted: tobe reset for preventing the Voperation oit said device,4

supervisor is not reset after a predetermined time afterA theY operationvof the box last .operated Inftesti'inonywhereof I aiiix ,my signature.p i f i Encina n; simisennr.

CERTFICATE 0F CORRECTRUN.

Patent No, i,645,353. Granted October 1i, i927, to

EDGAR E. SAMSBURY.

eers in ehe Ii is hereby certified that error epA printed specificationoi the quiring ooiiecion as foil above numbered patent re ows: Page 5',line 23, claim 6, after the word "said" insei the Word "pnirolm and thatthe said Letters Paent shonid be read with this correction iiierein i:

hat the same may conform to the record of the casse in the Patent iiioe.

Signed and sealed this ist dey ef November, A. D. 1927.

M. J., Moore, Seel. Acting Commissioner of Patents.

